US20030137611A1 - Optical Assembly - Google Patents

Abstract

Abstract of Disclosure

The present invention is disclosed an optical assembly comprises an optical engine in a carrier, which is fixed a lower frame on the one side of the carrier. The lower frame has an inlet approach to one side of the optical engine that enable the projection lens of the optical engine to extend the lower frame. A first mirror is fixed on the other side of the lower frame, in front of the projection lens. Exit of the lower frame is on the optical path of the first mirror and is disposed on an inlet of the upper frame. A second mirror is fixed on rear of the upper frame on the optical path along with the optical reflection path of the first mirror. The optical reflection path of the second mirror faces the exit of the upper frame, which is provided a screen.

Description

Background of Invention
• 1.Field of the Invention[0001]
• The present invention relates to a rear projection display, and more particularly relates to an optical assembly of optical system.[0002]
• 2.Description of the Prior Art[0003]
• The importanceof visualization of information had been recognized widely with rapid development of optical technology, meanwhile, importance and demand of rear projection television, which is a part of display device, had increased rapidly. Hence, rear projection industry"s focus of research and development is to raise ability of products to compete by maintaining brightness and clear quality of image regarding productivity and cost, meanwhile still is easy to assemble and provide repair service.[0004]
• Please refer to Figure 1 for the overall optical system structure of a prior-art rear projection television. A[0005]screen 14 in the front, abase 15 at the bottom, and arear cover 16 at the backside constitute the interior of the rear projection television; wherein the interior of the rear projection television has acarrier 11 on thebase 15, and thecarrier 11 has anoptical engine 10 on it. Afirst mirror 122 is fixed in the front of theoptical engine 10, and furthermore asecond mirror 131 is disposed on the inner side of therear cover 16 at the back of thescreen 14. The operation of the optical system of the rear projection television is by means of generating a beam with video information from theoptical engine 10 on thecarrier 11 and projecting the beam onto thefirst mirror 122. The beam is then reflected onto thesecond mirror 131 from thefirst mirror 122, and finally onto thescreen 14, which constitutes the optical system projection architecture.
• Maintaining each component in corresponding position and projection angle precisely is essential to prevent images from distortion and aberration. There are plenty of disadvantages of conventional optical assembly of projection television to be improved for. Since the[0006]optical engine 10, thefirst mirror 122, thesecond mirror 131 and thescreen 14 are fixed on different supporting component, when using different appearance design, all optical system components must be adjusted, such adjustment takes man work and time meanwhile increases manufacturing cost; On the other hand, optical system must be moved whole when needs to be repaired, it and the above-mentioned adjustment all cause difficulty for repair.
Summary of Invention
• An object of the present invention is to provide an optical assembly that can suitable for various rear projection televisions with different appearance design to decrease cost and raise the ability of products to compete.[0007]
• Another object of the present invention is to provide an optical assembly that is easily and movable to raise the efficiency of repairing and assembling.[0008]
• These and other objects of the present invention are achieved by an assembly comprising an optical assembly is disclosed having an optical engine in a carrier, which is fixed a lower frame on the one side of the carrier. The lower frame has an inlet approach to one side of the optical engine that enable the projection lens of the optical engine to extend the lower frame. A first mirror is fixed on the other side of the lower frame, in front of the projection lens. Exit of the lower frame is on the optical path of the first mirror and is disposed on an inlet of the upper frame. A second mirror is fixed on rear of the upper frame on the optical path along with the optical reflection path of the first mirror. The optical reflection path of the second mirror faces the exit of the upper frame, which is provided a screen.[0009]
• These and other objectives of the claimed invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.[0010]
Brief Description of Drawings
• FIG.[0011]1 is a schematic view of an optical assembly according to the prior art;
• FIG.[0012]2is aperspective view of an optical assembly according to the present invention;
• FIG.[0013]3 is a cross-sectional view of an optical assembly according to the present invention;
• FIG.[0014]4is a perspective view of second embodiment of optical assembly according to the present invention;
• FIG.[0015]5 is an assembling schematic view of an optical assembly according to the present invention.
Detailed Description
• A preferred embodiment of the present invention will be explained with reference to the accompanying drawings. Please refer to FIG. 2 for the perspective view of the optical assembly according to a preferred embodiment of the present invention, which comprises an[0016]optical engine 25 in acarrier 21, which is fixed alower frame 22 on the one side of thecarrier 21. Thelower frame 22 extend upward to form anupper frame 23, which is provided ascreen 24 on the front of theupper frame 23 to constitute an optical assembly.Please refer to FIG. 3, thelower frame 22 has aninlet 221 approach to on side of theoptical engine 25 that enable theprojection lens 251 of theoptical engine 25 to extend with an appropriate distance into thelower frame 22. Afirst mirror 222, to be used to reflect the light beam from theprojection lens 251, is fixed inclinedly on the other side of theinlet 221 of thelower frame 22, in front of theprojection lens 251. A plurality of adjusting components (such as screws) are disposed protuberantly in rear of thefirst mirror 222, i.e. the opposite side of thelower frame 22. Such adjusting components extend into a side of thelower frame 22 to support thefirst mirror 222, enable to adjust incline angle of thefirst mirror 222 to make optical adjustment. Aexit 223 of thelower frame 22 faces the optical path of thefirst mirror 222 for reflecting light of thefirst mirror 222 to go through theexit 223. Aninlet 231 of theupper frame 23 connect with theexit 231. Asecond mirror 232 is fixed on inner rear side of theupper frame 23 on the optical path along with the optical reflection path of thefirst mirror 222. The reflected light beam of thesecond mirror 232 from thefirst mirror 222 go through theexit 233 of theupper frame 23, and theexit 233 sets in front of theupper frame 23. Ascreen 24 is provided on theexit 233 to cover theexit 233.
• Since the[0017]optical assembly 20 of the present invention containing components such as theoptical engine 25 and thelower frame 22 are fixed on thecarrier 21, the relative position of such components is fixed with thecarrier 21. For theupper frame 23 is fixed on thelower frame 22, relative positions of thefirst mirror 222, thesecond mirror 232 and thescreen 24 in theupper frame 23 andlower frame 22 interior are fixed basically. By merely maintaining the structure of theoptical assembly 20 of the present invention, we can make relative positions and projection angle of theoptical engine 25, thefirst mirror 222, thesecond mirror 232 and thescreen 24 fixed, and make light beam which contain information from theoptical engine 25 project into thelower frame 22 through theprojection lens 251, then reflected to thefirst mirror 222, then enter into theinlet 231 of theupper frame 23 with being reflected by thefirst mirror 222 through theexit 223 of thelower frame 22 to make information being displayed on thescreen 24 of theexit 233 through thesecond mirror 232, meanwhile we can ensure the optical precision and quality of the product.
• Similarly, the upper frame 23and the[0018]lower frame 22 of theoptical assembly 20 of the present invention may be integrated as a whole one. Besides the aforementioned embodiment of plate type frame, please refer to FIG. 4, the present invention can fix thefirst mirror 222, thesecond mirror 232 and thescreen 24 on the framework type frame to ensure the relative position of respective optical components. Moreover, the adjusting component224 of thefirst mirror 222 may be provided on the rear of thesecond mirror 232 to adjust the incline angle.
• Please refer to FIG. 5, the present invention maintains fixed relative position and angle of respective optical components to constitute an independent optical assembly by the[0019]carrier 21, thelower frame 22 and theupper frame 23, therefore, the present invention is suitable for projection televisions in different design style of outlooks from various manufacturers. Upon assembling, just to fix the optical assembly containing theoptical engine 25, thelower frame 22, theupper frame 23, thefirst mirror 222, thesecond mirror 232 and thescreen 24 on thebase 30 and thecase 40, thebase 30 includes themotherboard 31, thepower supply 32,thespeaker 33 and thepanel 34, then the whole procedure is finished, without adjusting respective optical components of theoptical assembly 20. When dissembling for repair, only to dissemble the wholeoptical assembly 20, won"t influence the relative optical precision of respective optical components, meanwhile, working efficiency is increased from preventing dissembling respective optical components and adjusting the relative position and angle when assembling.
• Based on all the abovementioned, the present invention has following advantages in comparison with projection televisions of prior art:[0020]
• 1.The present invention maintains fixed relative position and angle of respective optical components to constitute an independent optical assembly by the carrier, the upper frame and the lower frame, is suitable for rear projection televisions in different design style of outlooks from various manufacturers.[0021]
• 2.The present invention provides a design of independent optical assembly. Upon dissembling, the whole optical assembly can be fixed on or moved from the base of rear projection television, assembling and repairing time can be decreased through decreasing adjustment of the relative position and angle of respective optical components can be decreased, hence working efficiency is increased, and reduce the cost.[0022]
• While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures. In addition, the optical assembly of the present invention herein enhances the performance of the conventional method and further complies with the patent application requirements and is submitted to the Patent and Trademark Office for review and granting of the commensurate patent rights.[0023]

Claims (10)

Claims

1. What claimed is:

1.An optical assembly, comprising:

a carrier has a upper surface;

an optical engine fixed on the upper surface, enable to project the light beam;

a lower frame fixed on the upper surface, is provided an inlet on the one side to receive the light beam; and provided a first mirror on the opposite side on the optical path to reflect the light beam to an exit;

a upper frame, is provided an inlet to connect the exit of the lower frame, and provided a second mirror in the rear on the optical path to reflect the light beam to an exit; and

a screen for covering the exit of the upper frame.

2.The optical assembly ofclaim 1,wherein the optical engine further comprising a projection lens to project the light beam.

3.The optical assembly ofclaim 2, wherein the projection lens extend to the inlet of the lower frame.

4.The optical assembly ofclaim 1, wherein the first mirror has an adjusting element for adjusting the angle.

5. 5 . The optical assembly ofclaim 1, wherein the second mirror has an adjusting element for adjusting the angle.

6. The optical assembly ofclaim 4, wherein the adjusting element passes through the frame side and protrude to the lower frame for adjusting the angle.

7. The optical assembly ofclaim 5, wherein the adjusting element passes through the frame side and protrude to the upper frame for adjusting the angle.

8. The optical assembly ofclaim 1, wherein the frame is plate type.

9. The optical assembly ofclaim 1, wherein the frame is framework type.

10. The optical assembly ofclaim 1, wherein the frame is a framework cover plate.

Images